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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
3
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.58 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.05 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

6 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.007

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.58 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

3.13 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 31 requests
FIX
2.5 MB transferred, 31 requests
Warning::
Page weighs 3.2 MB (2.5 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
Fonts are 382 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 382 KB
Info::
CSS is 355 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 355 KB
Info::
31 HTTP requests
Info::
Estimated 0.52 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
31 requests
0.52 g CO2 per page load
Images 1.1 MiB 46%
JavaScript 486.8 KiB 19%
Fonts 382.3 KiB 15%
CSS 355.3 KiB 14%
HTML 101.3 KiB 4%
Other 28.7 KiB 1%
Other 556 B 0%
Other 547 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.5 MiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
31 resources · 2.5 MB · 232 KB savings available
FIX
31 resources · 2.5 MB · 232 KB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~232 KB of savings available
Warning::
30 third-party resources (100% of weight)
Info::
3 resources over 200KB
31 resources · 2.5 MiB · 30 third-party 1.5 MiB over 1MB target
Image 47% · 1.2 MiB
JavaScript 19% · 486.8 KiB
Font 15% · 382.3 KiB
CSS 14% · 355.3 KiB
Document 4% · 101.7 KiB
Other 0% · 1.1 KiB

~231.7 KiB of savings available

Remove unused JavaScript: 231.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://www.uky.edu/sites/default/files/styles/big... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uky.edu/sites/default/files/styles/big... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 1.1 MB
0 oversized -0 KB
6 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
3 scripts, 232 KB unused
REVIEW
3 scripts, 232 KB unused
Warning::
https://www.uky.edu/sites/default/files/js/js_44EV...: 80 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TRB...: 79 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-RS8V...: 72 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 232 KB
232 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.uky.edu/sites/default/files/js/js_44EVD20UMAjS2joD5pTR0B5WV8v5AhNGzuuOL81vEjI.js?scope=footer&delta=0&language=en&theme=uky_see_theme&include=eJwtyUsOgCAQBNELOWHrbUjLdMDIDAtE4-2Nn92r1Nh0Drm2BXUajw2ri-P4qylq_3wmZEmldbpAVSoWvu-KnYx7oTEYM8To4wao6yC8135 KB80 KB (60%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TRBK72178 KB79 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-RS8VY27RLL&cx=c&gtm=4e64h1174 KB72 KB (41%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
JS Execution Cost
321ms total JS execution
PASS
321ms total JS execution
Info::
https://www.uky.edu/: 139ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-RS8V...: 63ms CPU time
Info::
Unattributable: 62ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TRB...: 56ms CPU time
Warning::
Third-party scripts: 321ms (100% of total)

Main Thread Breakdown

Script Evaluation 33% Other 26% Style & Layout 22% Rendering 8% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.uky.edu/139ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-RS8VY27RLL&cx=c&gtm=4e64h163ms51ms11ms3rd
Unattributable62ms1ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TRBK7256ms42ms12ms3rd
A+
Font Loading
9 fonts (382 KB)
PASS
9 fonts (382 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

382 KB total

Render-blocking

0

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 2.6 s LCP 3.1 shttps://use.typekit.net/af/a851eb/00000000000000007735a6b4/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/a851eb/00000000000000007735a6b4/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 20.1 KiB — 16 ms — font-display: swaphttps://www.uky.edu/modules/uky_platform/limestone/fonts/icons-5ead906cf5.woff2icons-5ead906cf5.woff2 https://www.uky.edu/modules/uky_platform/limestone/fonts/icons-5ead906cf5.woff2 — 6.2 KiB — 303 ms — font-display: swaphttps://use.typekit.net/af/79b8d0/00000000000000007735a6a2/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3l https://use.typekit.net/af/79b8d0/00000000000000007735a6a2/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3 — 19.4 KiB — 19 ms — font-display: swaphttps://use.typekit.net/af/ed550a/00000000000000007735a69c/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/ed550a/00000000000000007735a69c/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 19.5 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/4619ac/00000000000000007735a6ac/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3l https://use.typekit.net/af/4619ac/00000000000000007735a6ac/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3 — 19.8 KiB — 21 ms — font-display: swaphttps://use.typekit.net/af/5ab2eb/00000000000000007735c741/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/5ab2eb/00000000000000007735c741/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 26.6 KiB — 22 ms — font-display: swaphttps://use.typekit.net/af/0a9c1f/0000000000000000774b978f/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/0a9c1f/0000000000000000774b978f/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 222.6 KiB — 26 ms — font-display: swaphttps://use.typekit.net/af/e39010/00000000000000007735a6b2/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3l https://use.typekit.net/af/e39010/00000000000000007735a6b2/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3 — 20.5 KiB — 25 ms — font-display: swaphttps://use.typekit.net/af/889bfc/00000000000000007735c752/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/889bfc/00000000000000007735c752/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 27.8 KiB — 25 ms — font-display: swap
l woff2 swap
Size 20 KB
Load time 16 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
icons-5ead906cf5.woff2 woff2 swap
Size 6 KB
Load time 303 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 19 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 17 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 21 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 27 KB
Load time 22 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 223 KB
Load time 26 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
l woff2 swap
Size 20 KB
Load time 25 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 28 KB
Load time 25 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~111 KB and ~222 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
31 requests over 4068ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.6 s LCP 3.1 shttps://uky.edu// https://uky.edu/ — 301 — 496 B — 492 ms — http/1.1https://www.uky.edu/www.uky.edu/ https://www.uky.edu/ — 200 — 101.3 KiB — 975 ms — http/1.1https://www.uky.edu/sites/default/files/css/css_biLuCB5Ob7BaMQkW_oVSBU1F-IQII3_3CjFDS9pcr5s.css?delta=0&language=en&theme=uky_see_theme&include=eJw1iksKgDAMBS9UzdbblJQ-tJi0i_RDb68o3QwzMJIUVksGyTJn0yqUAhtcu-NBp5TA8rtyylvm_tb0Bvh6QbGWnjCMPu5aYhM8JXwlPwwww.uky.edu/sites/default/files/css... https://www.uky.edu/sites/default/files/css/css_biLuCB5Ob7BaMQkW_oVSBU1F-IQII3_3CjFDS9pcr5s.css?delta=0&language=en&theme=uky_see_theme&include=eJw1iksKgDAMBS9UzdbblJQ-tJi0i_RDb68o3QwzMJIUVksGyTJn0yqUAhtcu-NBp5TA8rtyylvm_tb0Bvh6QbGWnjCMPu5aYhM8JXwlPw — 200 — 332.9 KiB — 959 ms — http/1.1https://www.uky.edu/sites/default/files/css/css_FKPVk_FBLfY4rElIwtQmSw8_z_XigDxPYrZk7hH5qb0.css?delta=1&language=en&theme=uky_see_theme&include=eJw1iksKgDAMBS9UzdbblJQ-tJi0i_RDb68o3QwzMJIUVksGyTJn0yqUAhtcu-NBp5TA8rtyylvm_tb0Bvh6QbGWnjCMPu5aYhM8JXwlPwwww.uky.edu/sites/default/files/css... https://www.uky.edu/sites/default/files/css/css_FKPVk_FBLfY4rElIwtQmSw8_z_XigDxPYrZk7hH5qb0.css?delta=1&language=en&theme=uky_see_theme&include=eJw1iksKgDAMBS9UzdbblJQ-tJi0i_RDb68o3QwzMJIUVksGyTJn0yqUAhtcu-NBp5TA8rtyylvm_tb0Bvh6QbGWnjCMPu5aYhM8JXwlPw — 200 — 20.0 KiB — 374 ms — http/1.1https://www.uky.edu/sites/default/files/styles/big_16x7/public/2026-04/hero.jpg?h=5d8399f9&itok=kdFamQgNwww.uky.edu/sites/default/files/sty... https://www.uky.edu/sites/default/files/styles/big_16x7/public/2026-04/hero.jpg?h=5d8399f9&itok=kdFamQgN — 200 — 170.1 KiB — 851 ms — http/1.1https://www.uky.edu/sites/default/files/styles/big_16x7/public/2026-04/hero-2.jpg?h=5d8399f9&itok=QjBi7MG-www.uky.edu/sites/default/files/sty... https://www.uky.edu/sites/default/files/styles/big_16x7/public/2026-04/hero-2.jpg?h=5d8399f9&itok=QjBi7MG- — 200 — 71.0 KiB — 751 ms — http/1.1https://cloud.typography.com/7932236/7395812/css/fonts.csscloud.typography.com/7932236/739581... https://cloud.typography.com/7932236/7395812/css/fonts.css — 200 — 278 B — 10 ms — http/1.1https://use.typekit.net/axt6iqz.cssuse.typekit.net/axt6iqz.css https://use.typekit.net/axt6iqz.css — 200 — 2.0 KiB — 16 ms — h2https://p.typekit.net/p.css?s=1&k=axt6iqz&ht=tk&f=15498.15501.15505.15506.15507.15510.15512.25629.25632.25633.25634.25635.25636.25637.25638.26839.26840.26841.26842.28900.28901.28904.28905.44884.44887.51588.51589&a=20469250&app=typekit&e=cssp.typekit.net/p.css?s=1&k=axt6iqz&h... https://p.typekit.net/p.css?s=1&k=axt6iqz&ht=tk&f=15498.15501.15505.15506.15507.15510.15512.25629.25632.25633.25634.25635.25636.25637.25638.26839.26840.26841.26842.28900.28901.28904.28905.44884.44887.51588.51589&a=20469250&app=typekit&e=css — 200 — 172 B — 15 ms — h2https://www.uky.edu/sites/default/files/styles/big_4/public/2025-11/ai-for-uky_1.webp?h=167fceb1&itok=_PJHiY9Twww.uky.edu/sites/default/files/sty... https://www.uky.edu/sites/default/files/styles/big_4/public/2025-11/ai-for-uky_1.webp?h=167fceb1&itok=_PJHiY9T — 200 — 39.4 KiB — 488 ms — http/1.1https://www.uky.edu/sites/default/files/styles/big_4/public/2025-05/whitaker-raven.webp?h=167fceb1&itok=7sw3-JHSwww.uky.edu/sites/default/files/sty... https://www.uky.edu/sites/default/files/styles/big_4/public/2025-05/whitaker-raven.webp?h=167fceb1&itok=7sw3-JHS — 200 — 46.4 KiB — 610 ms — http/1.1https://www.uky.edu/sites/default/files/styles/big_4/public/2024-08/working-together.webp?h=167fceb1&itok=RrquP4WTwww.uky.edu/sites/default/files/sty... https://www.uky.edu/sites/default/files/styles/big_4/public/2024-08/working-together.webp?h=167fceb1&itok=RrquP4WT — 200 — 46.3 KiB — 499 ms — http/1.1https://www.uky.edu/sites/default/files/js/js_44EVD20UMAjS2joD5pTR0B5WV8v5AhNGzuuOL81vEjI.js?scope=footer&delta=0&language=en&theme=uky_see_theme&include=eJwtyUsOgCAQBNELOWHrbUjLdMDIDAtE4-2Nn92r1Nh0Drm2BXUajw2ri-P4qylq_3wmZEmldbpAVSoWvu-KnYx7oTEYM8To4wao6yC8www.uky.edu/sites/default/files/js/... https://www.uky.edu/sites/default/files/js/js_44EVD20UMAjS2joD5pTR0B5WV8v5AhNGzuuOL81vEjI.js?scope=footer&delta=0&language=en&theme=uky_see_theme&include=eJwtyUsOgCAQBNELOWHrbUjLdMDIDAtE4-2Nn92r1Nh0Drm2BXUajw2ri-P4qylq_3wmZEmldbpAVSoWvu-KnYx7oTEYM8To4wao6yC8 — 200 — 135.3 KiB — 833 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-TRBK72www.googletagmanager.com/gtm.js?id=... 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https://region1.analytics.google.com/g/collect?v=2&tid=G-RS8VY27RLL&gtm=45je64h1v874416860z871425623za20gzb71425623zd71425623&_p=1776805087814&_gaz=1&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&are=1&cid=1354751217.1776805088&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512543&sid=1776805088&sct=1&seg=0&dl=https%3A%2F%2Fwww.uky.edu%2F&dt=Home%20%7C%20University%20of%20Kentucky&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=2348 — 204 — 547 B — 65 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-RS8VY27RLL&cid=1354751217.1776805088&gtm=45je64h1v874416860z871425623za20gzb71425623zd71425623&rcb=0&aip=1&dma=1&dma_cps=a&gcd=13l3lPl2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266401~117512543stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-RS8VY27RLL&cid=1354751217.1776805088&gtm=45je64h1v874416860z871425623za20gzb71425623zd71425623&rcb=0&aip=1&dma=1&dma_cps=a&gcd=13l3lPl2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266401~117512543 — 204 — 556 B — 71 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-RS8VY27RLL&cid=1354751217.1776805088&gtm=45je64h1v874416860z871425623za20gzb71425623zd71425623&rcb=0&aip=1&dma=1&dma_cps=a&gcd=13l3lPl2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266401~117512543&z=1223172881www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-RS8VY27RLL&cid=1354751217.1776805088&gtm=45je64h1v874416860z871425623za20gzb71425623zd71425623&rcb=0&aip=1&dma=1&dma_cps=a&gcd=13l3lPl2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266401~117512543&z=1223172881 — 200 — 408 B — 77 ms — h2https://www.uky.edu/themes/custom/uky_see_theme/images/wty.gifwww.uky.edu/themes/custom/uky_see_t... https://www.uky.edu/themes/custom/uky_see_theme/images/wty.gif — 200 — 664.9 KiB — 1.2 s — http/1.1https://www.uky.edu/modules/uky_platform/limestone/images/campus-map-texture.jpgwww.uky.edu/modules/uky_platform/li... https://www.uky.edu/modules/uky_platform/limestone/images/campus-map-texture.jpg — 200 — 11.7 KiB — 389 ms — http/1.1https://www.uky.edu/themes/custom/uky_see_theme/favicon.icowww.uky.edu/themes/custom/uky_see_t... https://www.uky.edu/themes/custom/uky_see_theme/favicon.ico — 200 — 28.2 KiB — 497 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 321ms · 453KB · $4/mo
www.uky.edu
Other
Optional
Execution 139ms
Transfer 101 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 174 KB
Unused 41%
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 62ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 178 KB
Unused 45%
Monthly Cost $1/mo

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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